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| author | Amir Goldstein <amir73il@gmail.com> | 2020-07-16 11:42:30 +0300 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2020-07-28 00:24:01 +0300 |
| commit | 691d976352c73f9b55486092625adbcedd5ca5c5 (patch) | |
| tree | 327ad0a044a0587b38ba9c31a2d1de40b6dcc831 /fs/notify/fanotify/fanotify.c | |
| parent | 7e8283af6edeb7dd9f8f18a429e6738c07f00ce4 (diff) | |
| download | linux-691d976352c73f9b55486092625adbcedd5ca5c5.tar.xz | |
fanotify: report parent fid + child fid
Add support for FAN_REPORT_FID | FAN_REPORT_DIR_FID.
Internally, it is implemented as a private case of reporting both
parent and child fids and name, the parent and child fids are recorded
in a variable length fanotify_name_event, but there is no name.
It should be noted that directory modification events are recorded
in fixed size fanotify_fid_event when not reporting name, just like
with group flags FAN_REPORT_FID.
Link: https://lore.kernel.org/r/20200716084230.30611-23-amir73il@gmail.com
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/notify/fanotify/fanotify.c')
| -rw-r--r-- | fs/notify/fanotify/fanotify.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c index 4d1edddfbbb4..bd9e88e889ea 100644 --- a/fs/notify/fanotify/fanotify.c +++ b/fs/notify/fanotify/fanotify.c @@ -535,7 +535,7 @@ static struct fanotify_event *fanotify_alloc_event(struct fsnotify_group *group, /* * With both flags FAN_REPORT_DIR_FID and FAN_REPORT_FID, we * report the child fid for events reported on a non-dir child - * in addition to reporting the parent fid and child name. + * in addition to reporting the parent fid and maybe child name. */ if ((fid_mode & FAN_REPORT_FID) && id != dirid && !(mask & FAN_ONDIR)) @@ -552,11 +552,17 @@ static struct fanotify_event *fanotify_alloc_event(struct fsnotify_group *group, * * For event on non-directory that is reported to parent, we * record the fid of the parent and the name of the child. + * + * Even if not reporting name, we need a variable length + * fanotify_name_event if reporting both parent and child fids. */ - if ((fid_mode & FAN_REPORT_NAME) && - ((mask & ALL_FSNOTIFY_DIRENT_EVENTS) || - !(mask & FAN_ONDIR))) + if (!(fid_mode & FAN_REPORT_NAME)) { + name_event = !!child; + file_name = NULL; + } else if ((mask & ALL_FSNOTIFY_DIRENT_EVENTS) || + !(mask & FAN_ONDIR)) { name_event = true; + } } /* @@ -575,7 +581,7 @@ static struct fanotify_event *fanotify_alloc_event(struct fsnotify_group *group, if (fanotify_is_perm_event(mask)) { event = fanotify_alloc_perm_event(path, gfp); - } else if (name_event && file_name) { + } else if (name_event && (file_name || child)) { event = fanotify_alloc_name_event(id, fsid, file_name, child, gfp); } else if (fid_mode) { |